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Title: Calculation Of Gas Lost Due To Breaks, Ruptures Or Third Party Damage
Author: E.G. Keramerer
Source: 1990 Gulf Coast Measurement Short Course (Now called ASGMT)
Year Published: 1990
Abstract: In order to be consistent In my companys methods of gas loss calculation I recently developed the following information which I hope will also be useful to anyone who has experienced problems when gas volumes need to be calculated due to pipeline ruptures, blowdowns, and purges. The formulas used in this report were derived from the Weymouth equation and critical flow concepts. It is noted that at any rupture, the biggest loss is usually due to the accidental blowdown (occurs before any block valves are closed), followed by drain loss (blowdown which begins after block valves are closed), and last is purge loss which is the smallest part of the total loss as it is done for a relatively short time at low pressure. So the total loss in an accidental pipeline rupture as defined by this paper, consists of blowdown loss plus drain loss plus purge loss.

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